Fujitsu today issued a new technical backgrounder describing how hybrid (HEV) and electric (EV) vehicle motors operate, and how the MB91580 series motor control microcontrollers (MCUs) simplify hybrid and electric vehicle design. The new MB91580 series, a part of the Fujitsu FR family of 32-bit RISC microcontrollers offers 3-phase inverter motor control and an embedded resolver interface for electric and hybrid electric vehicles. The Fujitsu MCUs offer high performance combined with optimized peripherals. The MB91580 series was designed to provide special features for efficient loopback control. The devices offer a 12-bit Analog to Digital Converter (ADC) and a 12-bit Resolver to Digital Converter (RDC) to detect motor current and position at high speed and with high resolution.
The electric angle of the revolver, which is calculated by the RDC, is latched into dedicated registers and synchronized with the three-phase current detected by the ADC. Control algorithms benefit from the floating point unit (FPU) and will speed up vector conversion and calculations using decimal point numbers by 10 to 15 percent compared to standard integer processing.The MB91580 series feature Fujitsu’s advanced flash memory technology, including dedicated program memory and a separate work flash for E2PROM emulation storage.